You have to cast the spell during battle for it to do anything, and it will usually revive just a portion of one stack. There is no way I know of to resurrect all your casualties.
The Paladin gets the scroll at the start. Anyone can buy it if it's offered for sale, but I don't think it is until fairly late in the game.
The Necro Call skill does revive some troops after a battle--randomly chosen for you. You can eventually get that skill after you work through the items above it on the skill tree.
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